Reply To: Light from bottles filled with water.

[Dustoffer]

Caulking eventually breaks down.  Will not work with anything but thin roofs in non-freezing areas.  It would need a some support wires.   Why not just cut the clear plastic bottle in half lengthwise and cut holes slightly smaller and caulk them on with adhesive caulk?    How about putting them high on the walls, instead, for no leaks.